Skip to content

free5GC Specification

  • 3GPP TS 23.501/23.502-Rel-15
  • 5G Standalone (SA) supported
  • Serviced-Based Interface (SBI) supported
    • Namf, Nsmf, Nausf, Nudm, Nudr, Nnssf, Nnrf, Npcf
  • N1, N2, N3, N4, N6, N9, interfaces supported
  • 5G SA Network Functions supported:
    • AMF: Access and Mobility Management Function
      • Registration Management, Connection Management, Reachability Management, Mobility Management, and Authentication
    • SMF: Session Management Function
      • Session Management, IP Assigning/Management
    • UPF: User Plane Function
      • Support multiple UPF and ULCL (uplink classifier)
      • Session and Service Continuity (SSC) mode 1
      • Packet Routing/Forwarding
    • CHF: Charging Function (will be supported in release v3.3.1)
      • Online/Offline Charging
      • Webconsole acts as BD (Billing Domain)
      • Flow-Based Charging on PDU Session
    • AUSF: Authentication Server Function
    • NRF: NF Repository Function
    • UDM: Unified Data Management
    • UDR: Unified Data Repository
    • PCF: Policy and Charging Function
    • NSSF: Network Slice Selection Function
    • N3IWF: Non-3GPP Interworking Function
    • N3IWUE: Non-3GPP Interworking User Equipment

Supported features

  • Registration
    • Initial Registration
    • Periodic Registration
    • Mobility Registration
    • Registration without authentication, due to RAN did the AMF reselection
  • NAS Reroute when serving AMF can not handle UE registration with unmatch NSSAI
  • Authentication
    • 5G-AKA
    • EAP-AKA'
  • NAS Security
    • Ciphering: NEA0, NEA1, NEA2, NEA3
    • Integrity: NIA0, NIA1, NIA2, NIA3
  • Deregistration:
    • UE-initiated Deregistration
  • Service Request:
    • UE triggered Service Request
    • Network Triggered Service Request
  • AN Release
  • PDU Session Establishment
  • PDU Session Modification (v3.3.0)
  • Converged Charging (CHF has been published, all of the functions will be enabled in the incoming release)
    • Billing Domain (webconsole)
    • ABMF, RF, and CGF built-in CHF
    • Flow-based Charging (FBC)
  • PDU Session Release
  • Handover
    • N2 Handover (Indirect mode not supported)
    • Xn Handover
  • QoS
    • Control Plane only:
      1. 5QI, ARP, GBR, MBR of QoS Flow (v3.3.0)
      2. Session-AMBR supported
  • Collection and reporting of usage data over N4 interface
    • Volume measurement periodically
  • UP Security
  • Multiple UPFs and ULCL (Uplink Classifier)
  • Multiple Slice and DNN
  • Dynamic/Static IPv4 address allocation